remove `blank?` calls on `==`
remove `blank?` calls on `==`

Since Mime::Type implements `method_missing`, and `blank?` triggers it's
positive branch:

  https://github.com/rails/rails/blob/f9dda1567ea8d5b27bd9d66ac5a8b43dc67a6b7e/actionpack/lib/action_dispatch/http/mime_type.rb#L342

We should stop calling `blank?`.

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